Is OAK PARK required to publish a Consumer Confidence Report?

Yes. OAK PARK is a community water system, and federal rules (40 CFR 141 Subpart O) require every community water system to publish a Consumer Confidence Report each year.

When is OAK PARK’s next Consumer Confidence Report due?

OAK PARK’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.

What is a Consumer Confidence Report?

A Consumer Confidence Report (CCR) is the annual drinking water quality report that community water systems must provide to the people they serve. It lists the contaminants detected in the system’s water during the year, where the water comes from, and how the results compare with federal limits. EPA’s revised CCR rule takes effect January 1, 2027, and the first reports in the new format are due July 1, 2027.

OAK PARK, IL · Cook County

OAK PARK Water System

Consumer Confidence Report status

OAK PARK must publish a Consumer Confidence Report — the annual drinking water quality report covering calendar year 2026 — by July 1, 2027.

As of August 1, 2026, EPA's federal records show no open violations for OAK PARK.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed August 1, 2026. This is a record-keeping and public-information tool — it does not replace Illinois’s official records. Always confirm current status with Illinois before making decisions based on this information.

System facts

System ID (PWSID): IL0312250
System type: Community Water System
Population served: 54,583
Service connections: 12,683
Ownership: local government
Water source: surface water (rivers, lakes, or reservoirs)

OAK PARK is one of 225 community water systems in Illinois in the 10,001 to 100,000 people size category, serving 54,583 people from surface water.

As of August 1, 2026, its federal record holds 6 entries between 1992 and 1997, all of which EPA lists as closed. Nothing has been added since 1997.

Of the 6, 5 are monitoring and reporting requirements — the category that accounts for about four in five of all violations in EPA's national dataset — rather than findings about the water itself. The record involves the Lead and Copper Rule.

Violation history

Water Quality Parameter M/R
—
Lead and Copper Rule
April 1, 1997 – June 30, 1997
Resolved
Water Quality Parameter M/R
—
Lead and Copper Rule
January 1, 1997 – March 31, 1997
Resolved
Public Education
Health-based
Lead and Copper Rule
January 1, 1994 – February 5, 1995
Resolved
Initial Tap Sampling for Pb and Cu
—
Lead and Copper Rule
January 1, 1994 – September 23, 1993
Archived
Initial Tap Sampling for Pb and Cu
—
Lead and Copper Rule
July 1, 1993 – September 23, 1993
Archived
Water Quality Parameter M/R
—
Lead and Copper Rule
July 1, 1992 – December 31, 1992
Resolved

Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)

Period	Violation	Contaminant / rule	Health-based	Status
April 1, 1997 – June 30, 1997	Water Quality Parameter M/R	Lead and Copper Rule	—	Resolved
January 1, 1997 – March 31, 1997	Water Quality Parameter M/R	Lead and Copper Rule	—	Resolved
January 1, 1994 – February 5, 1995	Public Education	Lead and Copper Rule	Health-based	Resolved
January 1, 1994 – September 23, 1993	Initial Tap Sampling for Pb and Cu	Lead and Copper Rule	—	Archived
July 1, 1993 – September 23, 1993	Initial Tap Sampling for Pb and Cu	Lead and Copper Rule	—	Archived
July 1, 1992 – December 31, 1992	Water Quality Parameter M/R	Lead and Copper Rule	—	Resolved

Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)

Enforcement actions

April 16, 1999State Compliance achieved2 linked violations
February 5, 1995State Compliance achieved1 linked violation
January 3, 1994State Compliance achieved1 linked violation
January 3, 1994State Compliance achieved1 linked violation
September 23, 1993State Compliance achieved1 linked violation
October 1, 1988State Public Notification requested1 linked violation
October 1, 1988State Violation/Reminder Notice1 linked violation

Common questions

Is OAK PARK required to publish a Consumer Confidence Report?: Yes. OAK PARK is a community water system, and federal rules (40 CFR 141 Subpart O) require every community water system to publish a Consumer Confidence Report each year.
When is OAK PARK’s next Consumer Confidence Report due?: OAK PARK’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does OAK PARK have any open drinking water violations on record?: As of August 1, 2026, EPA's federal records show no open violations for OAK PARK.
What is a Consumer Confidence Report?: A Consumer Confidence Report (CCR) is the annual drinking water quality report that community water systems must provide to the people they serve. It lists the contaminants detected in the system’s water during the year, where the water comes from, and how the results compare with federal limits. EPA’s revised CCR rule takes effect January 1, 2027, and the first reports in the new format are due July 1, 2027.

Contact

DUFFY, ERIN

708-358-5704

OAK PARK, IL 60302